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22 Cards in this Set
- Front
- Back
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What is a compensationg filter?
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A specially designed attenuating device used to compensate for variations in tissue densities.
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List three radiographic procedures that would benefit from using a filter.
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AP T Spine
Danelius-Miller (Axiolateral) Hip Swimmers |
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For what pediatric exam is a filter recommneded? Why?
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Scoliosis exam. Because, the filter reduces patient dose while improving image quality.
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Where are most filters placed?
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Between the tube and the patient.
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The simplest and most comman filter shape is the__________.
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Wedge
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List the two most common materials used to make filters.
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Leaded Plastic (Clear Pb)
Aluminum |
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A disadvantage of aluminum filters is _____________.
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Aluminum filters block the field light.
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When using a compensating filter composed of aluminum, it becomes necessary to ___________________.
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Position the central ray to the patient and the IR before putting the filter in place.
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Which filter material can become objectionably heavy, if made for certain exams?
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Leaded Plastic
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What is the unique composition of the boomerang filter?
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Silicon rubber compound.
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Filters placed under the patient may cause _________, which can be objectionable to the radiologist.
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Artifacts
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List the two broad filter categories based upon their placement.
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Collimator mounted
Contact |
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Which category of filters have no effect on patient exposure?
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Contact
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Explain the precaution radigraphers must take when using compensationg filters.
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Radiographers must use extreme caution when mounting and removing compensationg filters on the collimator while the x-ray tube is over the patient.
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What additional advantage is gained with the use of a collimator-mounted filter?
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Decreased patient entrance dose.
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Which type of filter is used for areas of the body where tissue density varies significantly from one end to the other along the long axis of the body?
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Wedge
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Which type of filter is best used for areas of the body where the subject density in the center is much greater than at the edges?
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Trough
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The Ferlic Swimmer's filter is used to improve:
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Lateral Cervicothoracic Spine...(Swimmer's)
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When using filters on an AP projection of the entire spine for scoliosis evaluation, the exposure technique is set to penetrate the:
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Lumbar Spine
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What type of filter is used for the lateral projection of a scoliosis exam?
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Double Wedge
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What type of filter is used for digital fluoroscopy?
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Convex and concave conical
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Computed Radiography may use a ____________to compensate for the round shape of the head.
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Bow-Tie
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